Question GPU isn't powering on. :(

Jul 11, 2020
Hi, I’m having problems with my GPU.

My old pc would shut off one second after I hit the power on button, so I decided to start building a new pc I was gathering parts for. Unfortunate that this all happened during the situation today, but I can’t live without my pc.

Everything seems to be working fine except the GPU. It isn’t powering on, and the motherboard has the VGA light on white. This is my first time building a pc, so I had my friend who’s built pc’s before help me along the way. But since it is my first time, I feel like I might be overlooking something really obvious.

Here’s my setup:
Mastercase H500P Mesh White
AMD Ryzen 5 3600 GHz 6-Core Processor
Asus TUF GAMING B550M-PLUS (WI-FI) Micro ATX MA4 Motherboard
Corsair Vengeance RGB Pro 16 GB (2 x 8 GB) DDR4-3200 CL16 Memory
Corsair RMx (2018) 850 W 80+ Gold Certified ATX Power Supply
Rocket Q NVMe PCle M.2 2280 SSD
Toshiba 2TB 7200 RPM Internal Hard Disk
Gigabyte AMD R9 390X GV-R939XWF-8GD

I think that’s all the parts I need to list. Please let me know if I’m missing something. The only old parts from my pc are the GPU and hard drive. Thank you for reading my post and helping, have a great day!